Hello guys, HashMap and ArrayList is two of the most useful classes from JDK and every Java programmer should be familiar with them. Because of their usefulness, they are also very popular on Java interviews. You will always find a couple of questions on HashMap, ArrayList and its close cousins like Hashtable and ConcurrentHashMap on various Java interviews, ranging from freshers to experienced, junior to senior programmers, and telephonic to face-to-face interviews. To help my readers to better prepare for Java interviews, I have shared some of the essential ArrayList interview questions in my last article and today I am going to share frequently asked questions on Java HashMap.
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